The XPath keeps changing time captured html/body/div/div/div and the XPath during application under test html/body/div/div/div
Please help me in this regards.
Is it a KendoUI? can you send a URL?
Just invoke this metho via JS executor on webdriver and it should set the date.
A URL to this UI will help.
Its a very organized date picker. I think you need to take a look at the tutorials here
this talks about the Select class that you have to use to set the correct values.